JS: Allowed items to be added and removed from GroupListInput
JS: Allowed items to be added and removed from GroupListInput

Example:

Group1 List { ++ Entity1 Entity2 }
Group1 List { -- Entity1 Entity2 }

Adding to List sets previous group inputs for the added group members
Removing from List does not clear any previous group inputs for the removed group members

Signed-off-by: Stephen Wong <6f34db11dd2258ec4ffa799eb0d7827f906cb1c6@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim